These are less common but equally significant.
It turned out that the canary had detected a buildup of toxic gases, which could have been deadly if they had stayed in the mine. Jack and his colleagues were grateful for the canary's warning, and from that day on, they made sure to pay close attention to their feathered friend.
In the 1930s, he noticed that patients with heart failure displayed distinct, thin lines near the lung borders. He theorized—correctly—that these were not vessels, but something else entirely. His observations laid the groundwork for understanding pulmonary edema non-invasively.
Long (2–6 cm), unbranching, oblique lines thinner than 1 mm.
"That's what I thought," Dr. Patel said. "But what's the story behind them?"
Septal lines in lung | Radiology Reference Article - Radiopaedia